Hardly any stretch in flower

didnt mean that first comment whats the temps been that can control stretching and air curculations to the lower part of the plant will control it

It looks healthy to me. Dont worry, it will grow in the next weeks. After the stretch, you have to defoliate. Happy growing!

Heavy feeding, on verge of toxicity. Too intense light. Genetics.

Poly is right it is mostly down to genetics some plants will double in size some plants will stay small this is prominent in auto strains as they have a predetermined life span. It can also happen to photoperiod strains breeders do have guidelines on the strain description that tell you the plant's build. sometimes they are spot on sometimes they are wrong you also have to keep in account how long you have vegged the plants for. If you have vegged them for a long time the flowering period is usually shorter because the plant has had more time to develop its preflowers. I like to give my girls enough time to show me when they want flipping or when they are ready with an abundance of preflowers. also bit of advice I would try defoliating a few days before the flip this will allow more bud sites to reach the light and form. also try spreading your branches through each of the holes in the tent you can still LST during flower. You need to fiill every square of the net and create a uniform canpoy this will maximise your lights potential it will also make sure all bud sites get even light distribution giving you a much larger havest. If you need any help on this check out my sugar bomb punch grow I used a net in that and trained a canopy and got 420g of dry bud of a single plant :) best of luck buddy.

genetics... too much light.. combination of the two. you can stunt a plant with light. the nodes would probably be tighter than what is seen here. If you did something 17days ago that increased intensity, that could be the cause and the previous growth would look more normal before that point. I think you have 2-6" left of vertical growth, if only 17 days after flip. someplants simply grow more after flip than others. if you have an inkling of such variance in growth pattern you can train them differently. I train lanky plants about 7-10 days beyond flip and the short bushy ones i let go vertically immediately at flip (scrog in use). Even doing that i often have to HST some taller colas if i have many strains running. Without a little familiarity, you just run with what happens and do your best with it. Your vege growth is certainly nearing an end but is not 100% done. If you think it's the light, go raise it 2-4" and see what happens over the next few days... stunting can take time to recover, so if oyu do this, committ to it and wait for an observable reaction. Within 1-3 days depending on severity of potential light stunting, you should see some visible differences in growth pattern... as long as some vege growth does remain. It would be an incredibly fast flowering plant if it's done by FD17. Shouldn't taper off till 4+ weeks. Definitely slows before 28-30d, but continues for a while. Longer flowering plants will exhibit vege growth deeper into flower phase. vege growth = growing leaves and stem elongation. even though it's in flower when you give a "long night," hormonally speaking, it is a transition as far as resulting growth.